Annular boring and reaming tool.



m 9 1 om 2 R P A D m u H O H T A P m I N B MR SD NN A G R Bm .B B0 B R AL U N A APPLIOATIOH FILED HAY 29, 1906.

. Ifiihenfor. BenjaminBrownsten. J5

aftu.

UNITED STATES OFFIQE.

BENJAMIN BROWNSTEIN, OF PHILADELPHIA, PENNSYLVANIA, ASSIGN OR OFONE-HALF TO HARRY L. ZOOKOVITZ, OF TRENTON, NEW JERSEY.

K To all whom it may concern:

ANNULAR BORING AND REAIVIING TOOL.

Specification of Letters Patent itatented April 23, 1907.

Application filed May 22, 1905. Serial No. 261,536.

Be it known that I, BENJAMIN BROWN- sTE1N-,a citizen of the UnitedStates, residing j at Philadelphia, in the county of Philadelphia andState of Pennsylvania, have invented certain new and useful Improve-.

ments in Annular Boring and Beaming Tools, of which the following is aspecification.

Thisinvention relates to improvements in annular boring and reamingtools, wherein there is a receding center, resiliently supported, sothat as the ring is cut the central portion or plug of metal which isremoved may pass within the tool.

Different methods of supporting the spring I to the center and to thetool are illustrated,

together with different forms of springs. The interior bore of the too]is spirally grooved or rifled. The center is split at several points toallow for .any difierences of expansion between it and the tool onaccount of different material of which they are composed, together withdifferent efiects caused by hardening or tempering, and other featureswhich are more fully set forth in the specification.

The invention is illustrated in the accom panying drawing inwhichsimilar parts are designated by similar characters ofreference,inwhich Figure .1.is a full length boring and reaming tool,partly in section, Fig. 2 isa boring and reaming tool minus its shank,and shown in central section, the center being supportedby a,spring ofalternate difierent diameters, a threaded holder for the sprmgi i333asectional view on line B. Figsli 4, 5',' of..a boring and reaming tool,showing in the spiral and grooving, or rifling of its interior-and aspringin two different diameters-with nd-holder having an enlar cd-fend.Fig ls'a cross section on line Q3, showingthe eccentric backin ofiF In-1 t e tool l-has a shank 2 suited to a socket which may be eitherstraight. or tapered, and the shank has an oil hole 3, and a connectedduce oil tothe interior chamber 5; the lower end of the tool beingtapered for reaming and oil hole 4, through whichto intro-.

(provided with cutting edges 6, from which l are spiral flutes 7.

At the lower inner end of the tool is a center spindle 8 secured in asocket which comprises a head 9 a body 10 and an annular shell 11, onlythe shell part closely fitting within the chamber 5, the head 9 and body10 being of less diameter than the shell 11, so as to clear the walls ofthe chamber 5; as the tool and shell may have unequal expansion andcontraction, owing to different ualities of metal being used, as well asto (itl'erent density and hardness. The shell is divided by slots 12(best seen in Figs. 2, 5) to make it in a measure yielding, and toprevent friction and sticking. The chamber 5 may be provided with spiralflutes 13 which leave recesses for oil flowing between the narrow ingthe cutting end and the annular center, clearly shown in Figs. 3, 4, 5,for guiding the shell 11.

In Fig. 1 the head 9 is screw threaded to the same pitch as the spring15 within which it is screwed and secured, the upper end of which assesthrough an eye 17 formed at the end of the spring, and by which thespring is kept from turning, as head 9 is app ied or removed.

In Figs. 2, 3 a spring is used which is wound in alternate groups ofcoils of a small diameter 18 and large diameter 19, the head 1 9 beingsecured to a large coil which has an end bent to enter a hole 20, whilethe upper end of the spring by a small coil 18. screws 21 and passesbeyond on to a neck 22 of less diameter than the interior of the screw.where it freely rests. under the head 23 se cured to the tool by pin 24,and having oil holes 25 therethrough. A sto plate 26 is inserted betweencoils 19 and as a projection 27 inside of the coil and projection 28 outside of the coil to keep it in placeg its object'being to prevent coils18 on neck 22 from being distorted so they cannot come off of end 21. Asthe tool is shortened by wearing. and grinding the spring must beshortened, and as the small coils 18 must always go freely over end 21,and as they are liable to be distorted by cutting, the large coils areprovided, which may be out without damage to the small coils.

intermediate bearing strips 14, for lubricat- In Fig. 3, the spring isheld by a modified form of holder comprising an end 29 having V shapedsides over which the coil is forced to a neck 30 on flange 31 secured tothe tool by pin 32.

In Fig. 4 is shown the clearance line formed by milling on an eccentricline 33 from cutting edge 34 to groove 7 on line C. C. Fig. 3.

Fig. 5 is an end View showing the taper 35 of the tapered reaming edge.

' I claim.

1. A' boring and reaming tool having an end with cutting edges forboring, a longitudinal chamber, reaming flutes upon the exteriorsurface, a spring secured Within the chamber, a socket within thechamber and secured to the spring and a centering device carried by thesocket.

2. An annular boring and reaming tool, a cutting end therefor having achamber therein, a spring suspended in the chamber, and a movable centerattached to the spring and comprising a spindle secured to a socketwhich socket in part clears the chamber and in part consists of a shellof annular shape which fits the chamber, said shell being provided withslots to allow for expansion and contraction.

3. In an annular oring and reaming tool, a cuttlng end therefor, havinga chamber therein provided 'wlth bearing surfaces and intermediate oilgrooves, a spring suspended in the chamber and a movable center securedto the spring, said center comprising a spindle'secured to a body whichin part clears the chamber and in part is a slotted shell fitting thechamber.

4. An annular boring and reaming too having a straight body part, achamber therein, the exterior of the body part terminating in a taperedreaming part provided With flutes, the exterior surface between thecutting edge of each flute and an adjoining flute being eccentric,cutting edges at the end1 of the tool, and a receding center for the tooI 5. An annular boring and reaming tool comprising a body portion havinga shank at ,one end and a cylindrical portion with a chamber at theother end, said latter end being provided with cutting edges and theextreme surface of the annular portion being tapered, and a springsecured inthe chamber and carrying a centering device adapted to recedeinto the chamber.

Intestimony whereof I affix my signature in presence of two witnesses. V

BENJAMIN BROWN STEIN. Witnesses: I

RANSOM C. WRIGHT, WILLIAM C. STOEVER.

